Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c30be8fa9bb428…

MALICIOUS

PDF

46.6 KB Created: 2020-10-26 16:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 516c785d6a101202f3b8b27654533b18 SHA-1: 73f41c7a37d777269cc1b8220c593370f90f0c4d SHA-256: 36c30be8fa9bb42830a48baa6c0f3725ace89a2bf3ab04d578577106c0a2ec52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to appear as search results for a book, leading to a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a SEO poisoning or link farm attack. The document body itself contains obfuscated text and the malicious URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/123?keyword=famous+five+book+10+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/glittering_images_camille_paglia.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/duzin.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/81871404625.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/10th_bipartite_settlement_for_bank_officers.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/aruba_switching_fundamentals_rev._16._41.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c74fe306-599f-466a-9660-329b1df0d101/bexebebijidovodinika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4683fec2-362b-4fad-bcc0-e0bc05fe8653/laxaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf9b3c4-9e49-4cf1-bd6f-9f1c56775c64/astroneer_how_to_get_tungsten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d7cb39-772f-4af0-a937-e2ac695495ea/nawidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a24a395-627c-4261-80ba-ac22b8022047/21716194395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaca810-1544-4560-8951-3549657cb667/jotug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f366e6ce-15a5-452f-b8cc-75ea1e131f0a/45497684796.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13ae4d7-decb-48a6-874e-656af9b9aa48/76871691731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48e4dca-eeb6-42e4-8bf4-658ad2dd9311/98318315018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee350d3-1541-4603-95b9-85544df0c6f3/vedeselelegowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d1e47c-faf2-4cde-b37d-65b4e392446b/1030124851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c6171e-6958-4fb8-936e-34e0743c1076/never_enough_sheet_music_flute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad3b94b-e00d-402b-92be-e5de6cb5fa3c/goleman_emotional_intelligence_scale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6224/2727/files/electro_optical_effects_in_silicon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/upper_intermediate_english_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6012/0737/files/ginamoxuritexoxuvane.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9939/6531/files/huawei_cun-u29_root_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2402/2202/files/14972939587.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000759b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 5472 bytes
SHA-256: 41f37f547f94108d2f42308d1794f71fda290bac5087275fe44972a2321022dd
font_01_sfnt_off00008839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8839 11008 bytes
SHA-256: 5398c9b08d88efbd0dd1b61e38ee56575ea622e33616a418d394112ca75e4514

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